You need to keep her isolated away from the others until all is healed (or the others will attack her)... if she has been "picked" on lately this may have led to reduced nutritional intake which may have been responsible for the prolapse.

did you push the prolapse back in? You can put her under a heat lamp and that will help relax her. Also give her some ASA (baby aspirin 80mg), you can get the generic kind from the dollar general store. Give 5, 5 grain tablets per 1 gallon of water and that will help with any pain she is in. Also reduce her protein intake for a bit, like if you were giving her oyster shell..don't now..the calcium sometimes contributes to it. If you'd like to read more on problems of prolapse and what causes it go HERE .